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Muzzle velocity of .30-40 fired from the 30" barrel of the rifle should be 1,960 feet per second at 53 feet from the muzzle. This corresponds to 2,000 fps at the muzzle.
The carbine's 22" barrel produces "80 feet per second less than in the rifle."
That calculates to 5.87 dice ± 10% or 5.28 to 6.46 which is 6d pi with a fudge from 5d+1 pi to 6d+2 pi.
Range should be 790/4,200 according to Vehicles.
Recall that the rifle calculates out to:
6.12 ± 10% or 5.51 to 6.74; 6d pi or 5d+2 pi to 7d-1 pi. Range of 940/4,600.
Modern ammo in a 24" sportified gun calculates to:
6.76 ± 10% or 6.08 to 7.43; 7d-1 pi or 6d pi to 7d+2 pi. Range of 790/4,200.
The stats from Adventure Guns gives:
6d+1 pi, range 1,000/3,900.
Ravenclaw Eric generously shared a letter he'd received from Steve Jackson Games when he asked after 3e stats for the Krag.
They gave the rifle 6d+1 with a range of 1,000/3,000 and the carbine 6d-1 with a range of 800/2,600.
Nope, there's no clear pattern to this...
Modern ammo behaves like the +P stats given in High Tech, but given the momentum numbers I'd leave the ST stat alone at 10†.
Carbine length barrels, either 22 or 24 inches long give about 84% the 1/2D range and 91% Max. according to Vehicles. That compares to the correspondence from SJG for 80% and 87%...
84% of 1000 is 840. 91% of 3,900 is (rounding to nearest 100's) 3,600.
Damage for the carbine with period ammo seems to run about a point lower than the rifle, so 6d pi.
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